Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cff30d699eb6a2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 21:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e111fd3c497c8fafeff51e34f1eb588 SHA-1: 6dd12f05ce4259879b898b8d95c63d8a8ad2e7b3 SHA-256: 17cff30d699eb6a2a5fc67a151bd2ce8a2ba8ce9e0fcfb58b086c75bc29b36d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=download+dominoes+gold+apk+for+android PDF link annotation
    • http://riviera.az/userfiles/file/bopavu.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/galebojavixejavag.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/44234685230.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/nugipasabusop.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zetedadenalubovezagaxira.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/kinajipujenup.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/savajekajesugegesivageda.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/26655356841.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/28468839476.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/25168014061.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/9014403757.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/kidofut.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zidiloselevurub.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/lirugomolowol.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/bujizu.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/6947303576.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sasijeri.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf76cc9ae---61340965957.pdfIn PDF document text
    • http://greenglobepms.com/uploads/92704674244.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f1cdbca2---40277012134.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421cc427771---bowilubumixotezagodaveras.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109080201316491.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tusoredi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tozot.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/jexekazikawojekefivun.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/zunabeguxewowijegofuwadi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 10924 bytes
SHA-256: 00b7e219bbbe2bc5ce130e2e27d0e6464e947723f43566a701c0d6c1514d37a9
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 17164 bytes
SHA-256: 566397c1535f43f3a3a0612fb82fbce5f8e7a7b2ef32c4e380ec6a0c024e4989
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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